Used as sample container for optical measurement over time. Because it is quite thin, it will be damaged with a slight collision. Because it was for optical measurement, thinner was more convenient and price was cheap so there was no problem.

When I opened the bubble wrap packing, ten or so pieces had already been broken from the end. I do not know at what point it was broken, but I feel that it is impossible for 250 packages from the thinness of the glass.